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Is there a high pitched noise coming from the machine?

A

The machine has a float in the dirty water tank that is designed to rise with the level of the water. However, if the machine is jolted, or there is a large amount of foam in the tank, the float may rise to the top. The rising float will block the suction and the machine will make a high pitched noise.

To return the float to its original position, simply switch the machine off, allow it to drop down and then try again